/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.aries.jndi.url;

import java.util.Hashtable;

import javax.naming.ConfigurationException;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;

/**
 * A factory for the aries JNDI context
 */
public class OsgiURLContextFactory implements ObjectFactory
{
  public Object getObjectInstance(Object obj, Name name, Context nameCtx,
      Hashtable<?, ?> environment) throws Exception
  {
    if (obj == null) {
      return new ServiceRegistryContext(environment);
    } else if (obj instanceof String) {
      Context ctx = null;
      try {
        
        ctx = new ServiceRegistryContext(environment);
        
        return ctx.lookup((String)obj);
      } finally {
        if (ctx != null) ctx.close();
      }
    } else if (obj instanceof String[]) {
      // Try each URL until either lookup succeeds or they all fail
      String[] urls = (String[])obj;
      if (urls.length == 0) throw new ConfigurationException("0");
      Context context = new ServiceRegistryContext(environment);
      try
      {
        NamingException ne = null;
        for(int i=0; i< urls.length; i++)
        {
          try
          {
            return context.lookup(urls[i]);
          }
          catch(NamingException e)
          {
            ne = e;
          }
        }
        throw ne;
      }
      finally
      {
        context.close();
      }    
      
    }

    return null;
  }

}
